not_a-bot

It seems to me that the advancements in AI didn't keep pace for example with the advancements in graphics. (Obviously AI is not easy) Are there some advancements in AI that are really substantial compared to AI years ago?

Thanks for the answer! I guess "simple" is always relative, also in respect to AI. :) But am I correct to assume, that there are several abstraction layers in AI programming: For example the AI is set to an "Aggression" state against a country which then leads to "Amass troops at border" (among other sub-behaviors) which then gives orders to units to move to the specific border?